EP 1311935 A2 20030521 - NOISE-SHAPED DIGITAL FREQUENCY SYNTHESIS
Title (en)
NOISE-SHAPED DIGITAL FREQUENCY SYNTHESIS
Title (de)
DIGITALE FREQUENZSYNTHESE MIT RAUSCHFORMUNG
Title (fr)
SYNTHÈSE DE FRÉQUENCE NUMÉRIQUE MODULÉE PAR LE BRUIT
Publication
Application
Priority
- US 0124085 W 20010801
- US 64536700 A 20000824
Abstract (en)
[origin: WO0217050A2] A clock generator for automatic test equipment generates clock signals from a reference clock. To generate a desired clock signal, a clock generator produces a time-quantized signal having a period equal to an integer number of reference clock periods and equal to the desired clock period, plus or minus a quantization error. For each cycle of the desired clock signal, a noise-shaping requantizer processes the quantization error to generate noise-shaping signals. The noise-shaping signals then establish delay values of a variable pipeline delay. The variable pipeline delay adjusts each period of the time-quantized signal by an integer number of reference clock cycles, based upon the noise-shaped signals. The effect of noise shaping the quantization error and selectively delaying the time-quantized signal is to shift jitter in the time-quantized signal from relatively low frequencies to relatively high frequencies, which can be filtered with a phase-locked loop.
IPC 1-7
IPC 8 full level
H03K 5/00 (2006.01); G06F 1/025 (2006.01); H03B 28/00 (2006.01); H03L 1/00 (2006.01); H03L 7/081 (2006.01); H03L 7/16 (2006.01); H03M 3/02 (2006.01)
CPC (source: EP KR US)
G06F 1/025 (2013.01 - EP US); H03L 7/08 (2013.01 - KR); H03L 7/081 (2013.01 - EP US); H03L 7/16 (2013.01 - EP US)
Citation (search report)
See references of WO 0217050A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0217050 A2 20020228; WO 0217050 A3 20020718; AU 7912101 A 20020304; CN 1447935 A 20031008; CN 1447935 B 20100505; EP 1311935 A2 20030521; JP 2004507916 A 20040311; JP 4620931 B2 20110126; KR 100865662 B1 20081029; KR 20030028816 A 20030410; TW 503621 B 20020921; US 6396313 B1 20020528
DOCDB simple family (application)
US 0124085 W 20010801; AU 7912101 A 20010801; CN 01814531 A 20010801; EP 01957367 A 20010801; JP 2002521678 A 20010801; KR 20037002666 A 20030224; TW 90119201 A 20010807; US 64536700 A 20000824